Peedeeick k gaednee



(No Model.)

F. N. GARDNER.

DRAPTING GOMPASSBS.

No. 349,840. Patented Sept. 28, 1886 Emma N PETERS. Pllmo-Luhognpher. washmghm. ac

UNITED STATES PATENT OFFICE.

FREDERICK N. GARDNER, OF HARTFORD, CONNECTICUT, ASSIGNOR, BY

MESNE ASSIGNMENTS, TO THE PRATT & \VHITNEY COMPANY, OF

SAME PLACE.

DRAFTING-C OMPASSES.

SPECIFICATION forming part of Letters Patent No. 349,840, dated September 28, 1886.

Application filed March 2-1, 1884.

To all whom it may concern:

Be it known that I, FREDERICK N. GARD- NER, of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Compasses; and I do hereby declare that the following is a full, clear, and exact description thereof, whereby a person skilled in the art can make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

Like letters in the figures indicate the same parts.

Figure 1 is, a view in elevation of my improved device. Fig. 2 is a view in vertical central section of same. Fig. 3 is a view in cross-section of same on plane denoted by line :0 w of Fig. 1. Fig. 4 is a detail view of a modified form of my device. Fig. 5 is a View in vertical central section of the same. Fig. 6 is a detail view in cross-section on line 3 y of Fig. 5. Fig. 7 is a detail view of the outer end of the beam, showing an improved method of holding a point. Fig. Sis a detail view in longitudinal central section through the point and the socketed end of the beam.

The object of myinvention is to provide for the use of draftsmen, machinists, and the like artisans, a tool of such construction as to be more cheaply made, and one that presents special advantages, as more particularly hereinafter described.

In the accompanying drawings, the letter a denotes a stock of metal, as steel, with a handle, a, that may be roughened in any or dinary way for convenience in using the instrument; b, a point-holding socket, which may have elastic jaws formed by boring out and slitting the stock, as shown; a, a point of steel adapted to fit said socket. A positive clamp,

d, is formed by the nut 0, working on the exterior thread on the stock and forcing an annular washer or collar, f, upon the beam 9, which is arranged to slide in a transverse central opening in the said stock. This beam is preferably of round steel wire of any merchantable size, flattened slightly on its upper surface to furnish a bearing or seat for the collar f, and one end is bent downward, as shown, to form the leg h of the device. The

placed in said socket.

Se1ialNo.ll5,Q-15. (No model.)

frictional clamp i is formed by the nut j, threaded in one part and grasping the beam with elastic jaws that hold it against acci dental movement but allow it to slide under a moderate pressure. The grasp is firm enough to move the beam by means of the slow-motion screw it, that is held against 1ongitudinal movement in the stock by any ordinary means.

In the modified form of my device shown in Figs. 4, 5, and 6, the frictional clamp 6 has an elongated nut orsleeve, jflwith an exterior thread and elastic jaws j, that also grasp the beam with a yielding pressure. This nut or sleeve is arranged in the main transverse opening in the stock, and the beam operates within it. The slow motion of the beam for finer adjustment of the legs is produced by means of the thumb-nut it, that is held against longitudinal movement in a socket, k", in the stock, and operates by means of an interior thread that engages the outer thread on the sleeve. The leg 71 at the outer endof the beam instead of being pointed, shown in Fig. 1, may be provided with a tubular socket, 71, having a lateral opening, h", into which the lower end of a spring, 2, projects and presses upon the side of a pencil or other point, on,

is secured to the leg,while the free end is preferably concaved in order to more securely grasp the cylindrical side of the pencil when the latter is placed in the socket, the spring being fixed at an angle with the pencil and biting into it. This peculiar means of holding the pencil or other point while it permits such point to be freely fed outward at the same time prevents the upward play of such point in the socket.

It is evident that this point-holding device may be used to hold either a pencil-lead, a point, or a pen, as desired.

1 claim as my invention 1. The combination of the stock (1, having the handle a and point-holding socket, with the point that forms the bearing-center, the sliding beam g, having the leg h, the positive clamp d, and the frictional clamp i, all sub stantially as described.

2. The combination of the stock a, having One end of the spring handle a, and point 0, nut e, and collar f, sliding beam g, nut j, with yielding jaws j that grasp the beam, and a thread engaging a slow-motion screw or nut fixed against lon- I to the beam and having its other end biting against the pencil at an angle with the latter, whereby return movement of the pencil is obstructed, all substantially as described.

5. In combination with the compassbeam 9, having the leg 72; with longitudinal socket h, and lateral opening h and point or pencil m, and aspring, Z, with one end fast to the beam standing at anangle with the pencil and having the edge of the free end resting against the pencil, whereby return movement of the latter is obstructed, all substantially as described.

FREDERICK N. GARDNER. Witnesses:

CHAS. L. BURDETT, EDWIN F. DIMooK. 

